/**
 * Http与Servlet工具类
 */
package com.jiang.sign.Utils;

/**
 * @author yk
 *
 */

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class ServletUtils {
	/**
	 * 用于servlet接收数据
	 *
	 * @param request
	 * @return
	 */
	public static String receiveData(HttpServletRequest request) {
		String json = null;
		try {
			BufferedReader br = new BufferedReader(
					new InputStreamReader((ServletInputStream) request.getInputStream(),"UTF-8"));
			String line = null;

			StringBuffer sb = new StringBuffer();
			while ((line = br.readLine()) != null) {
				sb.append(line);
			}
			json = sb.toString();
			sb = null;
			line = null;
			br.close();
			br = null;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return json;
	}

	public static String getIp(HttpServletRequest request) {

		String ipAddress = request.getHeader("x-forwarded-for");
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getRemoteAddr();
			if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
				// 根据网卡取本机配置的IP
				InetAddress inet = null;
				try {
					inet = InetAddress.getLocalHost();
				} catch (UnknownHostException e) {
					e.printStackTrace();
				}
				ipAddress = inet.getHostAddress();
			}
		}
		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
															// = 15
			if (ipAddress.indexOf(",") > 0) {
				ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
			}
		}
		return ipAddress;
	}
}
